<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>padding不会影响盒子大小的情况</title>
    <style>   
       h1 {
           /* width: 100%; */
           height: 200px;
           background-color: pink;
           padding: 30px;
       }
       div {
           width: 300px;
           height: 100px;
           background-color: purple;
       }
       div p {
           padding: 30px;
           background-color: skyblue;
       }
    </style>
</head>
<body>
   <h1></h1>
   <div>
       <p></p>
   </div>
</body>
</html>